📄 tanstack/pacer/latest/docs/framework/react/examples/useDebouncer
File: useDebouncer.md | Updated: 11/15/2025
Source: https://tanstack.com/pacer/latest/docs/framework/react/examples/useDebouncer
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React Example: UseDebouncer
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tsx
import { useState } from 'react'
import ReactDOM from 'react-dom/client'
import { useDebouncer } from '@tanstack/react-pacer/debouncer'
import { PacerProvider } from '@tanstack/react-pacer/provider'
function App1() {
// Use your state management library of choice
const [instantCount, setInstantCount] = useState(0)
const [debouncedCount, setDebouncedCount] = useState(0)
// Lower-level useDebouncer hook - requires you to manage your own state
const debouncer = useDebouncer(
setDebouncedCount,
{
wait: 800,
enabled: () => instantCount > 2, // optional, defaults to true
// leading: true, // optional, defaults to false
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
status: state.status,
executionCount: state.executionCount,
}),
)
function increment() {
// this pattern helps avoid common bugs with stale closures and state
setInstantCount((c) => {
const newInstantCount = c + 1 // common new value for both
debouncer.maybeExecute(newInstantCount) // debounced state update
return newInstantCount // instant state update
})
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 1</h1>
<table>
<tbody>
<tr>
<td>Status:</td>
<td>{debouncer.state.status}</td>
</tr>
<tr>
<td>Execution Count:</td>
<td>{debouncer.state.executionCount}</td>
</tr>
<tr>
<td colSpan={2}>
<hr />
</td>
</tr>
<tr>
<td>Instant Count:</td>
<td>{instantCount}</td>
</tr>
<tr>
<td>Debounced Count:</td>
<td>{debouncedCount}</td>
</tr>
</tbody>
</table>
<div>
<button onClick={increment}>Increment</button>
<button
onClick={() => debouncer.flush()}
style={{ marginLeft: '10px' }}
>
Flush
</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(debouncer.store.state, null, 2)}
</pre>
</div>
)
}
function App2() {
const [searchText, setSearchText] = useState('')
const [debouncedSearchText, setDebouncedSearchText] = useState('')
// Lower-level useDebouncer hook - requires you to manage your own state
const setSearchDebouncer = useDebouncer(
setDebouncedSearchText,
{
wait: 500,
enabled: () => searchText.length > 2, // optional, defaults to true
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
isPending: state.isPending,
executionCount: state.executionCount,
}),
)
function handleSearchChange(e: React.ChangeEvent<HTMLInputElement>) {
const newValue = e.target.value
setSearchText(newValue)
setSearchDebouncer.maybeExecute(newValue)
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 2</h1>
<div>
<input
autoFocus
type="search"
value={searchText}
onChange={handleSearchChange}
placeholder="Type to search..."
style={{ width: '100%', marginBottom: '1rem' }}
/>
</div>
<table>
<tbody>
<tr>
<td>Is Pending:</td>
<td>{setSearchDebouncer.state.isPending.toString()}</td>
</tr>
<tr>
<td>Execution Count:</td>
<td>{setSearchDebouncer.state.executionCount}</td>
</tr>
<tr>
<td colSpan={2}>
<hr />
</td>
</tr>
<tr>
<td>Instant Search:</td>
<td>{searchText}</td>
</tr>
<tr>
<td>Debounced Search:</td>
<td>{debouncedSearchText}</td>
</tr>
</tbody>
</table>
<div>
<button onClick={() => setSearchDebouncer.flush()}>Flush</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(setSearchDebouncer.store.state, null, 2)}
</pre>
</div>
)
}
function App3() {
const [currentValue, setCurrentValue] = useState(50)
const [debouncedValue, setDebouncedValue] = useState(50)
const [instantExecutionCount, setInstantExecutionCount] = useState(0)
// Lower-level useDebouncer hook - requires you to manage your own state
const setValueDebouncer = useDebouncer(
setDebouncedValue,
{
wait: 250,
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
isPending: state.isPending,
executionCount: state.executionCount,
}),
)
function handleRangeChange(e: React.ChangeEvent<HTMLInputElement>) {
const newValue = parseInt(e.target.value, 10)
setCurrentValue(newValue)
setInstantExecutionCount((c) => c + 1)
setValueDebouncer.maybeExecute(newValue)
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 3</h1>
<div style={{ marginBottom: '20px' }}>
<label>
Current Range:
<input
type="range"
min="0"
max="100"
value={currentValue}
onChange={handleRangeChange}
style={{ width: '100%' }}
/>
<span>{currentValue}</span>
</label>
</div>
<div style={{ marginBottom: '20px' }}>
<label>
Debounced Range (Readonly):
<input
type="range"
min="0"
max="100"
value={debouncedValue}
readOnly
style={{ width: '100%' }}
/>
<span>{debouncedValue}</span>
</label>
</div>
<table>
<tbody>
<tr>
<td>Is Pending:</td>
<td>{setValueDebouncer.state.isPending.toString()}</td>
</tr>
<tr>
<td>Instant Executions:</td>
<td>{instantExecutionCount}</td>
</tr>
<tr>
<td>Debounced Executions:</td>
<td>{setValueDebouncer.state.executionCount}</td>
</tr>
<tr>
<td>Saved Executions:</td>
<td>
{instantExecutionCount - setValueDebouncer.state.executionCount}
</td>
</tr>
<tr>
<td>% Reduction:</td>
<td>
{instantExecutionCount === 0
? '0'
: Math.round(
((instantExecutionCount -
setValueDebouncer.state.executionCount) /
instantExecutionCount) *
100,
)}
%
</td>
</tr>
</tbody>
</table>
<div style={{ color: '#666', fontSize: '0.9em' }}>
<p>Debounced to 250ms wait time</p>
</div>
<div>
<button onClick={() => setValueDebouncer.flush()}>Flush</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(setValueDebouncer.store.state, null, 2)}
</pre>
</div>
)
}
const root = ReactDOM.createRoot(document.getElementById('root')!)
root.render(
// optionally, provide default options to an optional PacerProvider
<PacerProvider
// defaultOptions={{
// debouncer: {
// leading: true,
// },
// }}
>
<div>
<App1 />
<hr />
<App2 />
<hr />
<App3 />
</div>
,
</PacerProvider>,
)
import { useState } from 'react'
import ReactDOM from 'react-dom/client'
import { useDebouncer } from '@tanstack/react-pacer/debouncer'
import { PacerProvider } from '@tanstack/react-pacer/provider'
function App1() {
// Use your state management library of choice
const [instantCount, setInstantCount] = useState(0)
const [debouncedCount, setDebouncedCount] = useState(0)
// Lower-level useDebouncer hook - requires you to manage your own state
const debouncer = useDebouncer(
setDebouncedCount,
{
wait: 800,
enabled: () => instantCount > 2, // optional, defaults to true
// leading: true, // optional, defaults to false
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
status: state.status,
executionCount: state.executionCount,
}),
)
function increment() {
// this pattern helps avoid common bugs with stale closures and state
setInstantCount((c) => {
const newInstantCount = c + 1 // common new value for both
debouncer.maybeExecute(newInstantCount) // debounced state update
return newInstantCount // instant state update
})
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 1</h1>
<table>
<tbody>
<tr>
<td>Status:</td>
<td>{debouncer.state.status}</td>
</tr>
<tr>
<td>Execution Count:</td>
<td>{debouncer.state.executionCount}</td>
</tr>
<tr>
<td colSpan={2}>
<hr />
</td>
</tr>
<tr>
<td>Instant Count:</td>
<td>{instantCount}</td>
</tr>
<tr>
<td>Debounced Count:</td>
<td>{debouncedCount}</td>
</tr>
</tbody>
</table>
<div>
<button onClick={increment}>Increment</button>
<button
onClick={() => debouncer.flush()}
style={{ marginLeft: '10px' }}
>
Flush
</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(debouncer.store.state, null, 2)}
</pre>
</div>
)
}
function App2() {
const [searchText, setSearchText] = useState('')
const [debouncedSearchText, setDebouncedSearchText] = useState('')
// Lower-level useDebouncer hook - requires you to manage your own state
const setSearchDebouncer = useDebouncer(
setDebouncedSearchText,
{
wait: 500,
enabled: () => searchText.length > 2, // optional, defaults to true
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
isPending: state.isPending,
executionCount: state.executionCount,
}),
)
function handleSearchChange(e: React.ChangeEvent<HTMLInputElement>) {
const newValue = e.target.value
setSearchText(newValue)
setSearchDebouncer.maybeExecute(newValue)
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 2</h1>
<div>
<input
autoFocus
type="search"
value={searchText}
onChange={handleSearchChange}
placeholder="Type to search..."
style={{ width: '100%', marginBottom: '1rem' }}
/>
</div>
<table>
<tbody>
<tr>
<td>Is Pending:</td>
<td>{setSearchDebouncer.state.isPending.toString()}</td>
</tr>
<tr>
<td>Execution Count:</td>
<td>{setSearchDebouncer.state.executionCount}</td>
</tr>
<tr>
<td colSpan={2}>
<hr />
</td>
</tr>
<tr>
<td>Instant Search:</td>
<td>{searchText}</td>
</tr>
<tr>
<td>Debounced Search:</td>
<td>{debouncedSearchText}</td>
</tr>
</tbody>
</table>
<div>
<button onClick={() => setSearchDebouncer.flush()}>Flush</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(setSearchDebouncer.store.state, null, 2)}
</pre>
</div>
)
}
function App3() {
const [currentValue, setCurrentValue] = useState(50)
const [debouncedValue, setDebouncedValue] = useState(50)
const [instantExecutionCount, setInstantExecutionCount] = useState(0)
// Lower-level useDebouncer hook - requires you to manage your own state
const setValueDebouncer = useDebouncer(
setDebouncedValue,
{
wait: 250,
},
// Optional Selector function to pick the state you want to track and use
(state) => ({
isPending: state.isPending,
executionCount: state.executionCount,
}),
)
function handleRangeChange(e: React.ChangeEvent<HTMLInputElement>) {
const newValue = parseInt(e.target.value, 10)
setCurrentValue(newValue)
setInstantExecutionCount((c) => c + 1)
setValueDebouncer.maybeExecute(newValue)
}
return (
<div>
<h1>TanStack Pacer useDebouncer Example 3</h1>
<div style={{ marginBottom: '20px' }}>
<label>
Current Range:
<input
type="range"
min="0"
max="100"
value={currentValue}
onChange={handleRangeChange}
style={{ width: '100%' }}
/>
<span>{currentValue}</span>
</label>
</div>
<div style={{ marginBottom: '20px' }}>
<label>
Debounced Range (Readonly):
<input
type="range"
min="0"
max="100"
value={debouncedValue}
readOnly
style={{ width: '100%' }}
/>
<span>{debouncedValue}</span>
</label>
</div>
<table>
<tbody>
<tr>
<td>Is Pending:</td>
<td>{setValueDebouncer.state.isPending.toString()}</td>
</tr>
<tr>
<td>Instant Executions:</td>
<td>{instantExecutionCount}</td>
</tr>
<tr>
<td>Debounced Executions:</td>
<td>{setValueDebouncer.state.executionCount}</td>
</tr>
<tr>
<td>Saved Executions:</td>
<td>
{instantExecutionCount - setValueDebouncer.state.executionCount}
</td>
</tr>
<tr>
<td>% Reduction:</td>
<td>
{instantExecutionCount === 0
? '0'
: Math.round(
((instantExecutionCount -
setValueDebouncer.state.executionCount) /
instantExecutionCount) *
100,
)}
%
</td>
</tr>
</tbody>
</table>
<div style={{ color: '#666', fontSize: '0.9em' }}>
<p>Debounced to 250ms wait time</p>
</div>
<div>
<button onClick={() => setValueDebouncer.flush()}>Flush</button>
</div>
<pre style={{ marginTop: '20px' }}>
{JSON.stringify(setValueDebouncer.store.state, null, 2)}
</pre>
</div>
)
}
const root = ReactDOM.createRoot(document.getElementById('root')!)
root.render(
// optionally, provide default options to an optional PacerProvider
<PacerProvider
// defaultOptions={{
// debouncer: {
// leading: true,
// },
// }}
>
<div>
<App1 />
<hr />
<App2 />
<hr />
<App3 />
</div>
,
</PacerProvider>,
)
